diff --git a/mtls/cli.py b/mtls/cli.py
index 9bd201c..d2731df 100644
--- a/mtls/cli.py
+++ b/mtls/cli.py
@@ -133,7 +133,7 @@ def get_servers(ctx, args, incomplete):
     "-s",
     type=str,
     help="Server to run command against.",
-    autocompletion=get_servers,
+    shell_complete=get_servers,
 )
 @click.option(
     "--config",